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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc52658db65c003a312f223e1379900a3e488ccf0b00af2b57ff6b9a80c8aa74' 
  AND token = 'N1cw5CdsAUhGp2iyzjWzzgFeXh9Gve43oryDdy1OL/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}